Statistics Review

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What is a statistical question?

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A statistical question is one that anticipates variability in the data and can be answered by collecting data. For example, 'What are the favorite ice cream flavors of CMS 6th graders?' is a statistical question.

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What makes a question statistical?

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A question is statistical if it involves a population, is measurable, and has variability. This means the answer can vary based on the data collected.

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How do you calculate the range of a data set?

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The range is calculated by subtracting the smallest number in the data set from the largest number. For example, in the data set 1, 1, 3, 5, 5, the range is 5 - 1 = 4.

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What is a 'Line of Best Fit'?

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A 'Line of Best Fit' is a straight line that best represents the data on a scatter plot. It shows the trend of the data points.

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What does positive correlation mean?

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Positive correlation means that as one variable increases, the other variable also increases. For example, the further you run, the further you jump.

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What is a population in statistics?

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A population is the entire group that you want to draw conclusions about. It can be people, animals, or things.

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What is a sample in statistics?

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A sample is a subset of the population that is used to represent the whole population in a study.

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What is variability in data?

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Variability refers to how much the data points differ from each other. High variability means the data points are spread out; low variability means they are close together.

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What is the mean of a data set?

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The mean is the average of a data set, calculated by adding all the numbers together and dividing by the number of values.

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What is the median of a data set?

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The median is the middle value when the data set is ordered from least to greatest. If there is an even number of values, the median is the average of the two middle numbers.